Idler wheel sliding block translation-type front duct ejector in variable cycle engine adjustable mechanism

Abstract

An idler wheel sliding block translation-type front duct ejector in a variable cycle engine adjustable mechanism comprises an outer machine box, an inner machine box, an actuation barrel, a connection arm, a rotary arm, a sleeve, a bearing, a bearing block, an elastic check ring, a valve body, an arc-shaped sliding block, a pivot sliding block and a knuckle bearing. Under drive of an actuation mechanism, the area of an outlet of an ejection flow channel between an inner duct and an outer duct of an engine is adjustable, the mechanism is simple, the number of parts is small, the weight is low, and compared with the design scheme of a front duct ejector of an existing variable cycle engine, the ejector is more stable and more reliable.

Description

technical field [0001] The invention relates to a translational front channel ejector in an adjustable mechanism of a variable cycle engine, which is used to change the working state of the engine to adapt to different flight conditions, and belongs to the technical field of high-performance gas turbine engines in aerospace technology. Background technique [0002] The foreign variable cycle engine design started in the 1970s, while the domestic variable cycle engine design began in this century. The adjustable mechanism of the variable cycle engine mainly includes three parts: the mode switching valve, the front duct ejector, and the rear duct ejector. The front duct ejector is located behind the middle afterburner fan and between the inner and outer ducts. Cooperate with the mode conversion valve and the rear duct ejector to realize the conversion of the engine between the two cycle modes of turbofan and turbojet, so that the engine can have the best performance in a wider...

AI Technical Summary

Problems solved by technology

But its disadvantage is that the actuator is placed in the outer culvert flow channel, which hinders the flow of air, and it is inconvenient to install, disassemble and maintain; the small contact area of ​​the graphite block cannot provide stable support

[0008] To sum up, the common deficiencies and shortcomings of the above-mentioned prior art include: the actuating mechanism is located in the inner cavity of the engine and is inconvenient to install, disassemble, and maintain, or is located inside the flow channel and hinders the flow of air; the valve body is supported by the inner casing, and the The frictional resistance of surface contact and line contact is relatively large, or graphite blocks are used for support, but the effect of reducing friction and support is limited

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